I do criticizing the actors if you think they individually did a bad job. However, sometimes even a lot of that blame should be shouldered by directors. For example we've seen Brie Larson act very well in other projects, including Lessons In Chemistry, so her performance in Captain Marvel was probably due to poor directing, IMHO.

Iman has nothing to worry about because from what I heard, even people who hated the movie loved her role in it. I might see it tonight to judge for myself. But nobody is criticizing her directly, so she's right to ignore the criticisms.